The 81st JSAP Autumn Meeting, 2020

Presentation information

Oral presentation

CS Code-sharing session » 【CS.4】 Code-sharing Session of 4.5 & 17

[9a-Z26-1~8] 【CS.4】 Code-sharing Session of 4.5 & 17

Wed. Sep 9, 2020 9:00 AM - 12:00 PM Z26

Yuhei Miyauchi(Kyoto Univ.)

11:30 AM - 11:45 AM

[9a-Z26-7] Ultrafast Exciton Dynamics in Semiconducting Carbon Nanotubes Probed by Terahertz Emission and Photocurrent Spectroscopy

〇(PC)Filchito Bagsican1, Michael Wais2,3, Natsumi Komatsu4, Weilu Gao4, Kazunori Serita1, Hironaru Murakami1, Karsten Held2, Iwao Kawayama1,5, Junichiro Kono1,3,4, Masayoshi Tonouchi1, Marco Battiato3 (1.Osaka Univ., 2.TU Wien, 3.Nanyang Tech. Univ., 4.Rice Univ., 5.Kyoto Univ.)

Keywords:carbon nanotubes, terahertz emission and photocurrent, exciton dynamics

Excitons dominate optical properties of single-wall carbon nanotubes (SWCNTs) with enormous binding energies and oscillator strengths. Here, we demonstrate that excitons also dominate terahertz (THz) dynamics in SWCNTs. We performed simultaneous THz emission and photocurrent measurements on a device consisting of aligned (6,5) SWCNTs, which were fully reproduced by theoretical simulations based on far-from-equilibrium Boltzmann transport equations. In particular, we were able to clarify the crucial roles of exciton autoionization (in THz emission) and impact generation (in nonlinear photocurrent). These results help understand the complex quasiparticle dynamics under an electric field in 1D materials for future device applications.